JP4659574B2 - Optical recording device - Google Patents

Description

  The present invention relates to an optical recording medium, and more particularly to an optical recording apparatus used for recording on a recordable compact disc (CD-R / RW), DVD-R / RW, DVD + R / + RW, and the like.

  For example, in a conventional multilayer optical recording medium having a plurality of recording layers, the servo characteristics and the recording method differ depending on the manufacturing method, but in general, information relating to the manufacturing method is not recorded on the optical recording medium, so that optimal recording cannot be performed. . As a result, the recording quality may deteriorate and recording and reproduction may not be possible.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art and to provide an optical recording apparatus capable of recording with good recording quality and stable recording operation even on optical recording media having different manufacturing methods.

As a result of intensive studies, the present inventor has found an optical recording apparatus that overcomes the above problems.
That is, the above-mentioned problems are solved by the following inventions 1) to 4 ) (hereinafter referred to as the present inventions 1 to 4 ).
1) In an optical recording apparatus that records information by irradiating light onto an optical recording medium while changing the optical properties of the optical recording layer, at least the manufacturing method from the optical recording medium is a reverse lamination method Corresponds to the part that performs the function of reading out information on whether the method is 2P or the 2P method, the part that functions to compare and read the information on the read manufacturing method with the information on the manufacturing method that has already been stored, and the manufacturing method specified by comparison reference With a function to set the servo characteristics and / or recording light emission waveform to be set, so that the recording method can be changed in accordance with the manufacturing method when recording on the optical recording medium recorded in advance by the manufacturing method An optical recording apparatus.
2) The optical recording apparatus according to 1), wherein the recording method changed in accordance with the manufacturing method is an emission waveform of recording light.
3) The optical recording apparatus according to 1) or 2), wherein the recording method changed according to the manufacturing method is servo characteristics during recording.
4 ) Prior to the start of recording, the manufacturer information and / or version information of the optical recording medium is read, and the recording method corresponding to the manufacturer information and / or the version information is recorded in the optical recording medium, the corresponding The optical recording apparatus according to any one of 1) to 3 ), wherein recording is set using a recording method.

Hereinafter, the present invention will be described in detail.
First, an outline of the configuration of the optical recording medium and the optical recording apparatus will be described.
DVD-RAM / WO, DVD-R, DVD + R, and DVD-RAM, DVD-RW, and DVD + RW media are writable (recordable) DVDs (Digital Versatile Discs).
The former DVD-RAM / WO, DVD-R, and DVD + R are DVDs that can be written only once (also referred to as DVD Write Once).
The latter DVD-RAM, DVD-RW, and DVD + RW are DVDs that can be written a plurality of times.
These optical recording media such as DVD + R and DVD + RW media are recorded and reproduced by an optical recording apparatus as shown in FIG.

FIG. 1 is a functional block diagram showing an example of the configuration of the main part of an optical recording apparatus. 1 is an optical recording medium, 2 is a spindle motor, 3 is an optical pickup, 4 is a motor driver, 5 is a read amplifier, and 6 is a servo. Means, 7 is a DVD decoder, 8 is an ADIP (ADless In Pre-groove) decoder, 9 is a laser controller, 10 is a DVD encoder, 11 is a DVD-ROM encoder, 12 is a buffer RAM, 13 is a buffer manager, and 14 is a DVD- A ROM decoder, 15 is an ATAPI / SCSI interface, 16 is a D / A converter, 17 is a ROM, 18 is a CPU, 19 is a RAM, 20 is a pulse generator, LB is a laser beam, and Audio is an audio output signal.
In FIG. 1, the arrows indicate the directions in which data mainly flow. In order to simplify the drawing, the CPU 18 that controls each block in FIG. Omitted. The ROM 17 stores a control program written in a code readable by the CPU 18. When the power of the optical recording medium recording apparatus is turned on, the program is loaded into a main memory (not shown), and the CPU 18 controls the operation of each unit according to the program and is necessary for the control. Data and the like are temporarily stored in the RAM 19.

The configuration and operation of the optical recording apparatus are as follows.
That is, the optical recording medium 1 is rotationally driven by the spindle motor 2. The spindle motor 2 is controlled by the motor driver 4 and the servo means 6 so that the linear velocity or the angular velocity is constant. This linear velocity or angular velocity can be changed stepwise.
The optical pickup 3 includes a semiconductor laser, an optical system, a focus actuator, a track actuator, a light receiving element, and a position sensor (not shown), and irradiates the optical recording medium 1 with a laser beam LB. The optical pickup 3 can be moved in the sledge direction by a seek motor. These focus actuators, track actuators, and seek motors cause the laser driver LB and the servo means 6 to bring the spot of the laser beam LB to a target location on the optical recording medium 1 based on signals obtained from the light receiving element and the position sensor. It is controlled to be located.

  At the time of reading, the reproduction signal obtained by the optical pickup 3 is amplified by the read amplifier 5 and binarized. In the read amplifier, the signal is binarized mainly through a process of normalizing the longest signal amplitude and a waveform equivalent function for amplifying the recordable mark signal. The input binarized data is demodulated 8/16 in the DVD decoder 7. Note that the recording data is modulated in units of 8 bits and modulated (8/16 modulation). In this modulation, 8 bits are converted into 16 bits. In this case, the combined bits are attached so that the number of previous “1” s and “0” s are equal on average. This is called “DC component suppression”, and the slice level fluctuation of the DC-cut reproduction signal is suppressed.

  The demodulated data is subjected to deinterleaving and error correction. Thereafter, this data is input to the DVD-ROM decoder 14, and further error correction processing is performed in order to increase the reliability of the data. The data that has been subjected to the error correction processing twice as described above is temporarily stored in the buffer RAM 12 by the buffer manager 13 and is arranged as sector data to the host computer (not shown) via the ATAPI / SCSI interface 15. It is transferred at a stretch. In the case of music data, the data output from the DVD decoder 7 is input to the D / A converter 16 and extracted as an analog audio output signal Audio.

At the time of writing, data sent from the host computer through the ATAPI / SCSI interface 15 is temporarily stored in the buffer RAM 12 by the buffer manager 13. Thereafter, the write operation is started. In this case, it is necessary to position the laser spot at the write start point before that. In the case of DVD + RW / + R, this point is obtained by a wobble signal that is previously engraved on the optical recording medium 1 by meandering tracks. Note that the above points are obtained by land pre-pits instead of wobble signals in DVD-RW / -R, and by pre-pits in DVD-RAM / RAM / WO.
The wobble signal in the DVD + RW / + R medium includes address information called ADIP, and this information is extracted by the ADIP decoder 8. The synchronization signal generated by the ADIP decoder 8 is input to the DVD encoder 10 so that data can be written at an accurate position on the optical recording medium 1.

The data in the buffer RAM 12 is subjected to addition of an error correction code and interleaving in the DVD-ROM encoder 11 and the DVD encoder 10, and is converted to 8/16 as a recording signal. The signal modulated for recording is converted into a recording light waveform suitable for the optical recording medium by the pulse generator 20 and recorded on the optical recording medium 1 via the laser controller 9 and the optical pickup 3.
In order to correct the efficiency of the optical pickup, it is possible to measure the diffracted light of the recording light directly by the light receiving element and change the recording power of the laser controller 9 by the power fluctuation. As a method for correcting the recording power for the optical recording medium, it is possible to correct the recording power of the laser controller 9 by measuring the efficiency of the recording power for the optical recording medium from the fluctuation of the reflected light during emission after recording. The address control method may be a configuration in which address information is obtained from land prepits or prepits.

FIG. 2 is a schematic diagram of a general information processing apparatus.
The information processing apparatus includes a control device, an interface, an optical disk device, a recording device (HDD), an input device, a display device, and the like. The control device includes a microcomputer, a main memory (none of which are shown), and the like, and controls the entire host.
The interface is a two-way communication interface with the optical disc apparatus and conforms to standard interfaces such as ATAPI and SCSI. When the optical recording apparatus of FIG. 1 is used as the optical disk apparatus, it is connected to the interface 15 of the optical recording apparatus of FIG. The connection form between the interfaces may be not only a cable connection using a communication line such as a communication cable (for example, a SCSI cable) but also a wireless connection using infrared rays.

The recording device (HDD) stores a program written in a code readable by the microcomputer of the control device. Note that when the drive power supply of the information processing apparatus is turned on, the program is loaded into the main memory of the control apparatus.
The display device includes a display unit (not shown) such as a CRT, LCD (liquid crystal display), or PDP (plasma display panel), and displays various information from the control device.
The input device includes at least one input medium (not shown) such as a keyboard, a mouse, and a pointing device, for example, and notifies the control device of various information input by the user. Note that information from the input medium may be input in a wireless manner. Further, as an integrated display device and input device, there is a CRT with a touch panel, for example.
The information processing apparatus is equipped with an operating system (OS). It is assumed that all devices constituting the information processing apparatus are managed by the OS.

The optical recording apparatus of the present invention has at least a unit that performs a function of reading information relating to whether the manufacturing method is the reverse lamination method or the 2P method from the optical recording medium, and the read information relating to the manufacturing method is already stored. A section that performs a function of comparing and referring to information on a manufacturing method, and a section that performs a setting function of servo characteristics and / or a recording light emission waveform corresponding to the manufacturing method specified by the comparative reference. Then, when recording on an optical recording medium on which a manufacturing method has been recorded in advance, the recording method is set so that it can be changed in accordance with the manufacturing method.
For example, when the optical recording apparatus of FIG. 1 is used, the CPU 18 has a function of calculating a recording waveform in accordance with the measured conditions, and the pulse generator 20 has a function of recording by changing the recording waveform. You can do it. As a recording waveform deformation condition, the set value of the recording power of the laser controller 9 is suitable.
Further, as in the present invention 4 , when there is an optimized setting for recording on the optical recording medium in the manufacturer information and / or version information recorded on the optical recording medium, It is preferable to set a recording method suitable for each optical recording medium by using the read information on the manufacturing method only in the case of an optical recording medium whose optimum conditions are unknown.

The optical recording apparatus of the present invention includes a function for evaluating conditions for changing a recording waveform in addition to an optical recording function in a general CD-R / RW drive, DVD-R, DVD-RW, and DVD + RW drive, and You may make it have a function which changes a recording waveform and continues recording.
FIG. 3 is a flowchart showing an example of processing in the optical recording apparatus of the present invention.
In the figure, (1) is a step of determining whether information such as the corresponding recording speed and type of the optical recording medium is known, and (2) is whether the manufacturer information and version information of the optical recording medium are known. (3) is a step of determining whether or not the manufacturing method of the optical recording medium is known. Depending on the result determined in each of these steps, it is determined which of the following (4) to (6) is applicable, and the servo setting and the recording strategy are changed.
(4) The optical recording apparatus has the optimum recording strategy parameter of the optical recording medium.
(5) The optical recording apparatus has more appropriate servo parameters and recording strategy parameters of the optical recording medium.
(6) When recording based on ADIP (address in pregroove) information.

As an example of the optical recording medium that is the subject of the present invention, the first substrate on the incident side of the recording light / L0 recording layer / L0 reflective layer / adhesive layer or L1 recording guide groove forming layer / L1 recording layer / L1 reflective layer / Examples thereof include a two-layer optical recording medium having a two-layer recording layer having a structure composed of a second substrate (protective substrate).
The first substrate must be transparent to the laser used when performing recording / reproduction from the substrate side, but need not be transparent when performing recording / reproduction from the recording layer side.
As the first substrate material, for example, a plastic such as a polyester resin, an acrylic resin, a polyamide resin, a polycarbonate resin, a polyolefin resin, a phenol resin, an epoxy resin, a polyimide resin, glass, ceramic, metal, or the like can be used.
A tracking guide groove or guide pit and a preformat such as an address signal may be formed on the surface of the substrate.
The second substrate must be transparent to the laser beam used when the laser beam is irradiated from the second substrate side, but may not be transparent when used as a simple protective plate.
The second substrate material that can be used is the same as the first substrate material. In addition, the manufacturing cost can be reduced by using the same material as the first substrate.

The recording layer causes an optical change due to the irradiation of the laser beam and records information by the change, and a material containing an organic dye as a main component is used as the material. Here, the main component means that it contains a sufficient amount of an organic dye necessary for recording and reproduction, but usually only an organic dye is used except for a small amount of additives that are appropriately added as necessary.
Examples of organic dyes include azo, formazan, dipyrromethene, (poly) methine, naphthalocyanine, phthalocyanine, tetraazaporphyrin, squarylium, croconium, pyrylium, naphthoquinone, anthraquinone (in) (Danthrene), xanthene, triphenylmethane, azulene, tetrahydrocholine, phenanthrene, and triphenothiazine dyes, or metal complexes thereof. Among them, azo (metal chelate) dye, formazan (metal chelate) dye, squarylium (metal chelate) dye, dipyrromethene (metal chelate) dye, trimethine cyanine dye, and tetraazaporphyrin dye are preferable.

The above dyes preferably have a decomposition start temperature of 100 to 360 ° C., particularly 100 to 350 ° C. as thermal decomposition characteristics. If the decomposition start temperature exceeds 360 ° C., pit formation at the time of recording is not performed well, and jitter characteristics deteriorate. Further, if the temperature is lower than 100 ° C., the storage stability of the disk deteriorates.
For the purpose of improving optical characteristics, recording sensitivity, signal characteristics, etc., the above dyes may be mixed with other organic dyes, metals, metal compounds, or a layer composed of a dye layer and other organic dyes, metals, metal compounds. May be laminated. Examples of such metals and metal compounds include In, Te, Bi, Se, Sb, Ge, Sn, Al, Be, TeO ₂ , SnO, As, Cd, and the like. It can be used by laminating.
Furthermore, various materials such as ionomer resin, polyamide resin, vinyl resin, natural polymer, silicone, liquid rubber, or a silane coupling agent may be dispersed and mixed in the dye, For the purpose of improving the properties, stabilizers (for example, transition metal complexes), dispersants, flame retardants, lubricants, antistatic agents, surfactants, plasticizers and the like can be used together.

The recording layer can be formed by ordinary means such as vapor deposition, sputtering, CVD, and solvent coating. When the coating method is used, the above-described dye or the like can be dissolved in an organic solvent, and the coating can be performed by a conventional coating method such as spraying, roller coating, dipping, or spin coating. Organic solvents generally used include alcohols such as methanol, ethanol and isopropanol; ketones such as acetone, methyl ethyl ketone and cyclohexanone; amides such as N, N-dimethylformamide and N, N-dimethylacetamide; sulfoxides such as dimethyl sulfoxide Ethers such as tetrahydrofuran, dioxane, diethyl ether and ethylene glycol monomethyl ether; esters such as methyl acetate and ethyl acetate; aliphatic halogenated hydrocarbons such as chloroform, methylene chloride, dichloroethane, carbon tetrachloride and trichloroethane Aromatics such as benzene, xylene, monochlorobenzene and dichlorobenzene; cellosolves such as methoxyethanol and ethoxyethanol; hexane and penta , Cyclohexane, and hydrocarbons such as methylcyclohexane.
The thickness of the recording layer is 100 to 10 μm, preferably 200 to 2000 μm.

Examples of the material for the reflective layer include metals such as Au, Ag, Cr, Ni, Al, Fe, and Sn that can be obtained with a high reflectivity and are not easily corroded, but from the viewpoint of reflectivity and productivity. Au, Ag, and Al are particularly preferable. In addition, these metals and metalloids may be used alone or as two or more alloys.
Examples of the method for forming the reflective layer include vapor deposition and sputtering.
The thickness of the reflective layer is 50 to 5000 mm, preferably 100 to 3000 mm.
As a material for the adhesive layer, any material can be used as long as it can adhere two optical recording media. In consideration of productivity, an ultraviolet curable adhesive or a hot melt adhesive is preferable. Further, an ultraviolet curable resin is suitable for the L1 recording guide groove forming layer. In this case, a material suitable for peeling the stamper forming the L1 recording guide groove is suitable.

Further, an undercoat layer may be provided to suppress corrosion on the L0 reflective layer.
The undercoat layer consists of (1) improved adhesion, (2) a barrier such as water or gas, (3) improved storage stability of the recording layer, (4) improved reflectance, and (5) a substrate from a solvent. And (6) guide grooves, guide pits, and preformats. For the purpose of (1), various polymer compounds such as ionomer resin, polyamide resin, vinyl resin, natural resin, natural polymer, silicone, liquid rubber, or a silane coupling agent can be used. For the purposes of (2) and (3), in addition to the polymer material, inorganic compounds such as SiO, MgF, SiO ₂ , TiO, ZnO, TiN, and SiN can be used, and Zn, Cu Ni, Cr, Ge, Se, Au, Ag, Al, or other metals or metalloids can be used. For the purpose of (4), an organic thin film having a metallic luster made of a metal such as Al, Au, or Ag, a methine dye, a xanthene dye, or the like can be used. For the purposes (5) and (6), an ultraviolet curable resin, a thermosetting resin, a thermoplastic resin, or the like can be used.
The thickness of the undercoat layer is 0.01 to 30 μm, preferably 0.05 to 10 μm.

Moreover, you may provide a protective layer or a substrate surface hard-coat layer as needed.
The protective layer and the hard coat layer on the substrate surface are (1) protection from scratches, dust and dirt on the recording layer (reflection / absorption layer), (2) improvement in storage stability of the recording layer (reflection / absorption layer), (3 ) Used for the purpose of improving the reflectance. For these purposes, the same material as the undercoat layer can be used. Also heat of polymethyl acrylate resin, polycarbonate resin, epoxy resin, polystyrene resin, polyester resin, cellulose resin, aliphatic hydrocarbon resin, natural rubber, styrene butadiene resin, chloroprene rubber, wax, alkyd resin, drying oil, rosin, etc. Organic materials such as softening and heat-melting resins can also be used. The most preferable is an ultraviolet curable resin excellent in productivity.
The film thickness of the protective layer or the substrate surface hard coat layer is 0.01 to 30 μm, preferably 0.05 to 10 μm.
As in the case of the recording layer, the undercoat layer, protective layer and substrate surface hard coat layer may contain a stabilizer, a dispersant, a flame retardant, a lubricant, an antistatic agent, a surfactant, a plasticizer, and the like. it can.

There are roughly two methods for manufacturing the two-layer optical recording medium.
The first method is a reverse lamination method in which an L0 recording layer and an L0 reflective layer are formed on a first substrate, an L1 reflective layer and an L1 recording layer are formed on a second substrate, and both are bonded with an adhesive layer. .
In the second method, an L0 recording layer and an L0 reflective layer are formed on a first substrate, and an L1 recording guide groove forming layer is laminated thereon to form a recording guide groove. This is a 2P method in which the recording layer and the L1 reflective layer are formed and finally the second substrate is bonded.
In these two methods, there is a difference between the recording guide grooves when forming the recording layers of L0 and L1 and the incident direction of the recording light. For example, in the reverse stacking method, the L0 recording layer has a recording guide groove formed on the first substrate on the incident light side, and a recording layer is formed thereon, but the L1 recording layer is a second layer on the opposite side to the incident light. A recording guide groove is cut in the substrate, and a recording layer is formed thereon. On the other hand, in the 2P method, L0 and L1 have a recording guide groove formed on the first substrate and the L1 recording guide groove forming layer on the incident light side, and a recording layer is formed thereon.
When the recording layer is formed by application with a liquid, the thickness varies depending on the unevenness of the recording guide groove. Therefore, the thickness of the L1 recording layer with respect to the irregularities of the L1 recording guide groove as seen from the incident light side by the two methods is different, and the servo conditions and the shape of the recording light emission waveform are different.
Although the two-layer optical recording medium has been described above, even in a multilayer optical recording medium having a larger number of recording layers, there is no essential difference in the method for forming the recording guide groove and the recording layer.

As an identification method of the manufacturing method, by adding information to the recording guide groove, information can be read only by the optical recording device, and there is no need to consider the compatibility of the reproducing device. In addition, recording density can be improved by writing a high-frequency signal using a phase modulation method.
As the format of the recording information, it is preferable to enter the version information of the medium that can be arbitrarily entered by the optical recording medium manufacturer. In the case of DVD + R_DL (double-layer optical recording medium), it is not necessary to consider compatibility with existing drives by entering the revision information that can be described arbitrarily by the manufacturer.

According to the first to third aspects of the present invention, it is possible to provide an optical recording apparatus capable of recording with good recording quality and stable recording operation even on an optical recording medium having a different manufacturing method depending on the reverse lamination method or the 2P method .
Furthermore, according to the fourth aspect of the present invention, it is possible to provide an optical recording apparatus capable of recording a known optical recording medium with optimized recording quality and recording operation.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited by an Example.

Example 1 and Comparative Example 1
As Example 1, an optical recording apparatus having the function shown in FIG. 3 was used. Further, a conventional optical recording apparatus having the function shown in FIG. FIG. 5 does not include step (3) in FIG. 3 and therefore does not have the option (5), and the remaining (1), (2), (4), and (6) are the same as those in FIG. In the case of the optical recording apparatus of Comparative Example 1, the servo setting for the unknown optical recording medium is adapted to the 2P method.
As an optical recording medium, a DVD + R_DL disc in which information on the manufacturing method is described in the information format shown in FIG. 4 is used, and a disc (optical disc A) created by the reverse stacking method and a disc created by the 2P method (optical disc B) ) Was recorded and reproduced, and the recording and reproduction operation was evaluated.
The evaluation results are shown in Table 1. In Example 1, both discs were recordable and reproducible, but in Comparative Example 1, the focus servo characteristics for the optical disc A did not match and a recording error occurred.

FIG. 3 is a functional block diagram illustrating an example of a main configuration of an optical recording device. 1 is a schematic diagram of an information processing apparatus. The figure which shows an example of the process in the optical recording device of this invention. The figure which shows the information format of the manufacturing method described on the disc. The figure which shows an example of the process in the conventional optical recording device.

Claims (4)

In an optical recording apparatus that records information by irradiating a light on an optical recording medium while changing the optical properties of the optical recording layer, at least whether the manufacturing method from the optical recording medium is a reverse lamination method or not. A section that functions to read out information on whether or not the method is valid, a section that functions to compare and read the information related to the read manufacturing method with information on the manufacturing method that has already been stored, and a servo that corresponds to the manufacturing method specified by comparison and reference It is provided with a section that performs a function of setting characteristics and / or a recording light emission waveform, and is set so that the recording method can be changed in accordance with the manufacturing method when recording on the optical recording medium on which the manufacturing method is recorded in advance. An optical recording apparatus characterized by comprising:   2. The optical recording apparatus according to claim 1, wherein the recording method changed in accordance with the manufacturing method is an emission waveform of recording light.   3. The optical recording apparatus according to claim 1, wherein the recording method changed corresponding to the manufacturing method is servo characteristics during recording. Prior to the start of recording, the manufacturer information and / or version information of the optical recording medium is read, and when the recording method corresponding to the manufacturer information and / or the version information is recorded in the optical recording medium, the corresponding recording the optical recording apparatus according to any one of claims 1 to 3, characterized in that it is set to record using the method.

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